## How does the VARX.S function (DAX) work?

The VARX.S function (DAX) returns the variance of a sample population.

## VARX.S Formula Syntax

VARX.S(
<table>, <expression>
)

## How do you use the VARX.S function?

This function is used to evaluate the given expression for each row of the given table and returns the variance of the expression

## Related Support Forum Posts

Dax Calculation question
Dax not working
DAX Buffer Calculation Query

## Considerations when using the VARX.S function

1. VARX.S evaluates expression for each row of table and returns the variance of expression; on the assumption that table refers to a sample of the population. If table represents the entire population, then you should compute the variance by using VARX.P.
2. VAR.S uses the following formula:∑(x – x̃)²/(n-1)where x̃ is the average value of x for the sample populationand n is the population size
3. Blank rows are filtered out from columnName and not considered in the calculations.
4. An error is returned if columnName contains less than 2 non-blank rows.

## Formula examples using the VARX.Sfunction

=VARX.S(InternetSales_USD, InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity]))

= VARX.S (West_Sales, West_Sales[Amount])

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